研究生: |
洪秀萍 Xiu-Ping Hong |
---|---|
論文名稱: |
超快速反應動態學研究:Cyanobenzene分子的光解反應 |
指導教授: |
鄭 博 元 教 授
Po-Yuan Cheng |
口試委員: | |
學位類別: |
碩士 Master |
系所名稱: |
理學院 - 化學系 Department of Chemistry |
論文出版年: | 2001 |
畢業學年度: | 89 |
語文別: | 中文 |
論文頁數: | 83 |
中文關鍵詞: | 超快雷射 、光解反應動態學 、多光子激發 、雷德堡能態 、雷射誘發螢光 |
外文關鍵詞: | Ultrafast laser, photodissociation, cyanobenzene, Rydberg state, pump-probe, RRKM, LIF |
相關次數: | 點閱:2 下載:0 |
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在本實驗中,我們運用超快雷射pump-probe技術配合雷射誘發螢光方法偵測cyanobenzene之光解產物CN(X) 的生成曲線,以研究cyanobenzene之光解反應動態學。在2.25 ns之延遲時間範圍內,實驗所得瞬時曲線是由四個指數遞增函數所構成,其中包含此分子由pump脈衝三光子和雙光子激發的成份。在三光子激發部分(總能量約9.57 eV),反應時間常數分別是τ1 = 0.35 ps、τ2 = 9.6 ps、τ3 = 180 ps,我們據此推測在此能量下CN(X)之生成應至少有三個反應途徑,且其反應時間量級暗示著反應是預解離過程,此點可由產物訊號上升之前有一時間延遲160 fs得到佐證。反應時間最長的部分(τ3 = 180 ps),我們推測由T1能態解離是一很有可能的反應途徑,並以RRKM理論計算得到相近反應時間以作為佐證。而雙光子激發部分(總能量約6.38 eV),因受限於移動平台移動距離,我們僅能估計其反應時間(τ4)之下限值為10 ns,並推測其反應路徑應是從起始能態S2經由T1能態解離。
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